JP3175608U - Slab through-hole forming mold - Google Patents

Abstract

In a form for forming a through hole of a slab, a form for forming a through hole of a slab that can be easily disassembled and removed without being industrial waste by being easily installed on the panel form of the slab and being divertable. Provide the bottom plate.
When a member of a mold for forming a through-hole provided in a slab and installed in a panel mold of the slab, end portions 12 of several fan-shaped movable folding parts 3 on the outer peripheral part are substantially fan-shaped. Expands the diameter in plan view and supports a rigid polyvinyl chloride tube from the inside. At this time, the gap 17 and the gap 14 are provided to such an extent that the adjacent movable folds 3 do not compete with each other and to the extent that the movable folds 3 facing downward slightly before installation do not compete with the central part even if the movable folds 3 are horizontal Forms. Further, when the through hole forming mold is disassembled, the movable folding portion 3 returns to the original downward direction, and as a result, the end portion 12 is reduced in diameter in plan view, so that the side pressure acting on the vinyl chloride pipe is reduced. It is opened and it becomes easy to remove the formwork.
[Selection] Figure 2

Description

  The present invention relates to a formwork used in a through hole forming work for a slab of a reinforced concrete structure.

Conventionally, slabs of reinforced concrete buildings are provided with through holes for passing vertical pipes, but void tubes (cylinders made of cardboard) are used as the formwork. The through hole formed by the void pipe is important for the purpose of laying the pipe, so that the formwork is placed on the panel formwork of the slab so that the formwork is not misaligned when placing the raw control. It is securely fitted to a thick disc-shaped guide fixed at a fixed position with a nail or wood screw.
Moreover, removal of the void pipe used as a formwork is so-called disposable because it breaks and dismantles after solidifying the concrete.

  As described above, in removing the void pipe after solidification of the concrete, since the residual pressure at the time of placing the raw concrete works and cannot be pulled out, it is broken and dismantled, and much time is spent on this complicated work. Further, since the broken void tube cannot be diverted, it must be treated as industrial waste, and the cost of the treatment is in addition to the problem of environmental impact due to incineration.

As a result of diligent research, the present inventor has found that a slab that can be easily disassembled and removed from an industrial waste by making the slab easy to install in a panel form and forming a through hole for the slab. Succeeded in developing a through-hole forming mold.
First, as for the installation of the formwork, it can be easily attached to the slab panel formwork as long as the center of the through-hole is in place. For removal after solidification of the concrete, hard vinyl chloride is attached to the cylinder part of the formwork. A form for forming a through hole for a slab is provided, which can be removed without being damaged by processing and using a pipe.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an image view of members constituting a mold according to the present invention. Here, reference numeral 1 is a bottom plate of a resin mold, and when the wood screw part 2 is screwed into the slab panel mold, the outer peripheral movable folding part 3 becomes horizontal, and as a result, the outer diameter increases. is doing. Reference numeral 4 denotes a nut that prevents the bottom plate 1 from moving upward when the screw is screwed in. Details of the bottom plate 1 will be described with reference to FIGS. 2 (a) and 2 (b).
Reference numeral 5 denotes a bolt of all screws, and a wood screw 2 is welded to the lower end of the bolt, and a steel wire 6 is welded to the upper part as the handle for screwing.
The cylinder 7 is a commercially available hard polyvinyl chloride pipe, and has a slitting process 8 that forms an angle of 45 degrees with the radial direction over the entire length in the axial direction, so that it is self-reducing when not supported from the inside. Reference numeral 9 denotes an upper lid with a hook for holding the cylindrical body 7 at a predetermined diameter, and reference numeral 10 denotes a washer.
After assembling the respective members as described above, the wing nut 11 is used for fixing. This also serves as an anti-lifting mechanism when placing live concrete.
FIG. 2A is a side cross-sectional view of the bottom plate 1, where reference numeral 12 denotes a portion that contacts the inner surface of the cylinder 7 when the movable folding part 3 is horizontal and holds the inner diameter of the cylinder at a predetermined dimension. Reference numeral 13 is a thin part for making the bent part 3 moveable, reference numeral 14 is a clearance gap when the reference numeral 3 is horizontal, reference numeral 15 is a clearance for accommodating the head of the wood screw 2, and reference numeral 16 is all screws. It is a through hole of the bolt 5.
FIG. 2B is a plan view of the bottom plate 1, where reference numeral 17 denotes a clearance gap when reference numeral 3 expands.
FIG. 3 is a side sectional view showing a state in which concrete is placed. Here, reference numeral 18 denotes a binding wire wound around the bottom plate 1 and the upper lid 8 in order to resist the side pressure at the time of placing the raw concrete. Reference numeral 19 is a slab panel, and reference numeral 20 is concrete cast.
The slab through-hole forming mold according to the present invention has the above-described configuration. The installation procedure is as follows. First, the tip of the wood screw 2 is aligned with a predetermined position, and then the handle 6 is turned and tightened. When the movable folding part 3 of the bottom plate 1 constrained to move upward by the nut 4 opens and reaches a horizontal position, the cylinder 7 is fixed in a predetermined inner diameter. After that, the reference numerals 7, 9, and 10 are set in order, and finally the wing nut 11 is tightened to fix the entire formwork to the panel formwork of the slab. The vicinity of the upper lid 9 is bound from the outside of the cylindrical body 7.
In addition, the removal procedure after solidification of the bottom plate 1 is easily removed because the outer peripheral portion of the bottom plate 1 is broken when the handle 6 is turned backward after removing the upper reference numeral 18, the reference numeral 10, the reference numeral 9 in this order. Can be removed.
Here, the cylindrical body 7 which has lost its holding force from the inside is self-reducing due to the properties of the hard vinyl chloride tube, so that it can be pulled out easily and can be recovered without damaging all the formwork members except the binding wire.

  As described above, the slab through-hole forming form according to the present invention is extremely easy to install and remove, and can be diverted, so that not only can the cost be reduced, but also industrial waste like conventional void pipes is not produced, so from the viewpoint of environmental conservation. Is also beneficial.

  It is an image figure which comprises this invention product.   (A) Side sectional view of bottom plate 1 (b) Plan view of bottom plate 1   It is construction sectional drawing of this invention product.

  The through-hole forming mold according to the present invention is used to form a through-hole provided in a slab prior to construction such as equipment piping passing through the slab of a reinforced concrete structure.

  One product of the present invention was diverted 10 times for a through hole of 110φ at a building site with a slab thickness of 180 mm on the upper floor. The bottom plate has an outer diameter of 100φ, a thickness of 15mm, and the total screw bolt is M8 with a total length of 210mm. A wood screw with a length of 25mm is attached to the lower end of the bottom plate. Welding, cylindrical part cut commercially available VU pipe (outer diameter 114φ) in the axial length, and upper lid is outer diameter 100φ of fitting part with VU pipe, length 15mm, same as outer diameter 115φ, thickness Although it was implemented with a configuration of 5 mm or more, there was no hindrance to the installation and removal work in 10 diversions, and in the removal work, it took 10 to 12 minutes per place in the conventional void tube. The product finished in 4-5 minutes.

  The formwork according to the present invention is very easy to handle in forming slab through-holes in reinforced concrete buildings and can be operated quickly, and contributes to environmental conservation through diversion. Significant improvement is expected and its marketability is considered sufficient.

1, bottom plate 2, wood screw 3, movable folding part on the outer periphery of the bottom plate 4, nut 5, full screw bolt 6, handle 7, hard vinyl chloride tube 8, slit 9, top lid 10, washer 11, wing nut 12, outer end of the bottom plate Part 13, thin part 14, clearance 15, clearance 16, through hole 17, clearance 18, cable tie 19, panel form 20, concrete

Claims (1)

Formwork member for forming a through-hole provided in the slab in advance prior to piping work such as equipment piping, etc.When installing the formwork, hold the formwork cylinder to a predetermined diameter from the inside and remove the formwork In this case, a slab that can be easily removed and recovered without damaging each member of the mold by having several movable bent portions 3 constituted by the sharp end portion 12, the thin portion 13 and the clearance gap 14 on the outer peripheral portion. The bottom plate of the through hole forming mold.

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